title: OTS-modified HA and its toughening effect on PLLA/HA porous composite.
abstract: In this paper, hydroxyapatite (HA) particles was modified with long-chain organic silane-Octadecyltrichlorosilane (OTS), and the modified particles were further used for preparing Poly(L-lactic acid) PLLA/HA porous composite. The modified particles were characterized by means of XRD, FTIR, and XPS techniques. Both XPS and FTIR results showed that OTS had been combined with HA, and the formation of P-O-Si bond, a covalent bond, on the HA particle surface was confirmed by XPS. OTS-modified HA particles were used to prepare porous composites by thermally induced phase separation method. The results showed that the composite had an interconnected pore structure with 100-300 mum macropores. With OTS dosage increasing during modification, the mechanical properties of PLLA/OTS-modified HA porous composites increased obviously. These results showed that OTS modification can effectively improve the interface compatibility between HA surface and PLLA.
authors.affiliation: Department of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, People's Republic of China. yangcl@zju.edu.cn
authors.forename: Chunli
authors.initials: C
authors.lastname: Yang
authors.forename: Kui
authors.initials: K
authors.lastname: Cheng
authors.forename: Wenjian
authors.initials: W
authors.lastname: Weng
authors.forename: Chunyu
authors.initials: C
authors.lastname: Yang
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D018786:Bone Substitutes / Q000737:chemistry; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D019245:Compressive Strength; D004548:Elasticity; D006882:Hydroxyapatites / Q000737:chemistry*; D019344:Lactic Acid / Q000737:chemistry*; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D015394:Molecular Structure; D010316:Particle Size; D011091:Polyesters; D011108:Polymers / Q000737:chemistry*; D033362:Powder Diffraction; D012821:Silanes / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013057:Spectrum Analysis; D013499:Surface Properties; D014965:X-Rays
chemical_list: D001672:Biocompatible Materials; D018786:Bone Substitutes; D020099:Coated Materials, Biocompatible; D006882:Hydroxyapatites; D011091:Polyesters; D011108:Polymers; D012821:Silanes; C061189:octadecyltrichlorosilane; D019344:Lactic Acid; C033616:poly(lactide)